In situ microscopic observations of low-cycle fatigue-crack propagation in high-Mn austenitic alloys with deformation-induced ϵ-martensitic transformation

Yun Byum Ju, Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Hiroshi Noguchi

研究成果: ジャーナルへの寄稿記事

25 引用 (Scopus)

抄録

In this study, the microstructural changes in Fe-30Mn-6Al, Fe-30Mn-4Si-2Al, and Fe-30Mn-6Si alloys that were subjected to bending fatigue tests with a total strain amplitude of 0.7% were observed in situ. The Fe-30Mn-4Si-2Al and Fe-30Mn-6Si alloys exhibited deformation-induced ϵ-martensitic transformation, but the Fe-30Mn-6Al alloy did not. The resistance of the Fe-30Mn-4Si-2Al alloy against fatigue-crack growth was superior to that of the other alloys, which is attributed to the effects of the ϵ-martensitic transformation. The ϵ-martensitic transformation in the alloy has three positive effects on crack growth: I) the suppression of strain localization; II) zigzag crack propagation, which enhances roughness-induced crack closure; and III) subcrack formation, which induces crack toughening, such as stress redistribution. On the other hand, the ϵ-martensitic transformation has a negative effect on crack growth, i.e., it causes subcrack initiation, which leads to the subcracks coalescing with the main crack. However, the ϵ-martensitic transformation in the Fe-30Mn-4Si-2Al alloy is optimized so that the positive effects are maximized and the negative effect is minimized, which results in the superior resistance of the alloy against low-cycle fatigue.

元の言語英語
ページ(範囲)326-336
ページ数11
ジャーナルActa Materialia
112
DOI
出版物ステータス出版済み - 6 15 2016

Fingerprint

Martensitic transformations
Fatigue crack propagation
Crack propagation
Fatigue of materials
Cracks
Crack closure
Bending (deformation)
Toughening
Surface roughness

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

これを引用

In situ microscopic observations of low-cycle fatigue-crack propagation in high-Mn austenitic alloys with deformation-induced ϵ-martensitic transformation. / Ju, Yun Byum; Koyama, Motomichi; Sawaguchi, Takahiro; Tsuzaki, Kaneaki; Noguchi, Hiroshi.

:: Acta Materialia, 巻 112, 15.06.2016, p. 326-336.

研究成果: ジャーナルへの寄稿記事

@article{d1e6e3b77fb744d9abf380eafcf2fe9c,
title = "In situ microscopic observations of low-cycle fatigue-crack propagation in high-Mn austenitic alloys with deformation-induced ϵ-martensitic transformation",
abstract = "In this study, the microstructural changes in Fe-30Mn-6Al, Fe-30Mn-4Si-2Al, and Fe-30Mn-6Si alloys that were subjected to bending fatigue tests with a total strain amplitude of 0.7{\%} were observed in situ. The Fe-30Mn-4Si-2Al and Fe-30Mn-6Si alloys exhibited deformation-induced ϵ-martensitic transformation, but the Fe-30Mn-6Al alloy did not. The resistance of the Fe-30Mn-4Si-2Al alloy against fatigue-crack growth was superior to that of the other alloys, which is attributed to the effects of the ϵ-martensitic transformation. The ϵ-martensitic transformation in the alloy has three positive effects on crack growth: I) the suppression of strain localization; II) zigzag crack propagation, which enhances roughness-induced crack closure; and III) subcrack formation, which induces crack toughening, such as stress redistribution. On the other hand, the ϵ-martensitic transformation has a negative effect on crack growth, i.e., it causes subcrack initiation, which leads to the subcracks coalescing with the main crack. However, the ϵ-martensitic transformation in the Fe-30Mn-4Si-2Al alloy is optimized so that the positive effects are maximized and the negative effect is minimized, which results in the superior resistance of the alloy against low-cycle fatigue.",
author = "Ju, {Yun Byum} and Motomichi Koyama and Takahiro Sawaguchi and Kaneaki Tsuzaki and Hiroshi Noguchi",
year = "2016",
month = "6",
day = "15",
doi = "10.1016/j.actamat.2016.04.042",
language = "English",
volume = "112",
pages = "326--336",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - In situ microscopic observations of low-cycle fatigue-crack propagation in high-Mn austenitic alloys with deformation-induced ϵ-martensitic transformation

AU - Ju, Yun Byum

AU - Koyama, Motomichi

AU - Sawaguchi, Takahiro

AU - Tsuzaki, Kaneaki

AU - Noguchi, Hiroshi

PY - 2016/6/15

Y1 - 2016/6/15

N2 - In this study, the microstructural changes in Fe-30Mn-6Al, Fe-30Mn-4Si-2Al, and Fe-30Mn-6Si alloys that were subjected to bending fatigue tests with a total strain amplitude of 0.7% were observed in situ. The Fe-30Mn-4Si-2Al and Fe-30Mn-6Si alloys exhibited deformation-induced ϵ-martensitic transformation, but the Fe-30Mn-6Al alloy did not. The resistance of the Fe-30Mn-4Si-2Al alloy against fatigue-crack growth was superior to that of the other alloys, which is attributed to the effects of the ϵ-martensitic transformation. The ϵ-martensitic transformation in the alloy has three positive effects on crack growth: I) the suppression of strain localization; II) zigzag crack propagation, which enhances roughness-induced crack closure; and III) subcrack formation, which induces crack toughening, such as stress redistribution. On the other hand, the ϵ-martensitic transformation has a negative effect on crack growth, i.e., it causes subcrack initiation, which leads to the subcracks coalescing with the main crack. However, the ϵ-martensitic transformation in the Fe-30Mn-4Si-2Al alloy is optimized so that the positive effects are maximized and the negative effect is minimized, which results in the superior resistance of the alloy against low-cycle fatigue.

AB - In this study, the microstructural changes in Fe-30Mn-6Al, Fe-30Mn-4Si-2Al, and Fe-30Mn-6Si alloys that were subjected to bending fatigue tests with a total strain amplitude of 0.7% were observed in situ. The Fe-30Mn-4Si-2Al and Fe-30Mn-6Si alloys exhibited deformation-induced ϵ-martensitic transformation, but the Fe-30Mn-6Al alloy did not. The resistance of the Fe-30Mn-4Si-2Al alloy against fatigue-crack growth was superior to that of the other alloys, which is attributed to the effects of the ϵ-martensitic transformation. The ϵ-martensitic transformation in the alloy has three positive effects on crack growth: I) the suppression of strain localization; II) zigzag crack propagation, which enhances roughness-induced crack closure; and III) subcrack formation, which induces crack toughening, such as stress redistribution. On the other hand, the ϵ-martensitic transformation has a negative effect on crack growth, i.e., it causes subcrack initiation, which leads to the subcracks coalescing with the main crack. However, the ϵ-martensitic transformation in the Fe-30Mn-4Si-2Al alloy is optimized so that the positive effects are maximized and the negative effect is minimized, which results in the superior resistance of the alloy against low-cycle fatigue.

UR - http://www.scopus.com/inward/record.url?scp=84964440179&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84964440179&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2016.04.042

DO - 10.1016/j.actamat.2016.04.042

M3 - Article

AN - SCOPUS:84964440179

VL - 112

SP - 326

EP - 336

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

ER -